Fix a description about SSL/TLS support drivers in readme

[supercaracal]

This PR follows the following PR.

• Remove error caused by hiredis ssl not supported #1077

[supercaracal]

It seems that it is not enough to use the feature yet. Should we wait for to be able to use the feature of hiredis-rb?

redis-rb/lib/redis/connection/hiredis.rb

Lines 12 to 27 in 610c783

	def self.connect(config)
	connection = ::Hiredis::Connection.new
	connect_timeout = (config.fetch(:connect_timeout, 0) * 1_000_000).to_i
	if config[:scheme] == "unix"
	connection.connect_unix(config[:path], connect_timeout)
	else
	connection.connect(config[:host], config[:port], connect_timeout)
	end
	instance = new(connection)
	instance.timeout = config[:read_timeout]
	instance
	rescue Errno::ETIMEDOUT
	raise TimeoutError
	end

• hiredis now supports SSL hiredis-rb#58
• Add possibility to establish SSL connection with SSL_VERIFY_NONE hiredis-rb#72

[supercaracal]

This PR is jumping the gun.